For some it's easier and for some it's harder. It seems that for you it is much harder than for most others.
With my 46 Years I know that I will never be able to get sub 10, maybe not even sub 20 average but cubing is about having fun and beating his own goals not the others.
But maybe you can work on your weaknesses. You could learn the algs you already know, so you can also learn some more.
The more algs you learn the easier it gets.
You mentionied N-Perm. Maybe you should try this one:
Na-Perm
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It's probably not the fastest but very easy to remember.
Same on the left side
Nb-Perm
View attachment 22954 x 5
Just turn down the block of two, push the D-Layer (both directions work if one fits you better), turn the block back up, do a U2 and repeat the whole process 5 times.
Maybe the pictures or the description could also help you to learn the algs.
They are from this page, but it is in german
CFOP-Methode: [Einführung und Cross] [F2L] [OLL] [PLL-Einführung] [PLL, alle Perms] In diesem Artikel: [Grupppe 1: A-Perms, E-Perm] [Gruppe 2: U-Perms, H-Perm, Z-Perm] [Gruppe 3: T-Perm, J-Perm und…
freshcuber.wordpress.com
If it helps you, I could translate some of the other pages to you or send you some more pictures.
I likes this page very much when I was learning the Perms. The Pictures also helped me.
But in the meantime after I learned all those PLL cases, I learn much faster and don't need the pictures anymore